A Photon's Epic Journey
Follow a single, self-aware particle of light on its chaotic 100,000-year escape from the Sun's core to its final destination: your skin.
Like Duolingo, but for A Photon's Epic Journey. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
A short one: 7 levels across 2 sections, about 14 minutes end to end, roughly 3 days at five minutes a day. It moves through The Great Solar Escape and The Sprint to Earth. It starts from scratch.
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Key ideas in A Photon's Epic Journey
- Extreme pressure and heat in the core force atoms to collide
- The Sun's interior is packed so tightly with particles that photons constantly collide
- The process of atoms smashing together (fusion) releases light as a byproduct
- Every collision deflects the photon in a new, unpredictable direction
- The origin of light in the Sun's core
- The physical movement of a photon through the Sun's interior
- Photons start as invisible, high-energy radiation in the core
- Constant collisions drain the photon's energy
- The zigzag path is so inefficient it adds millennia to the journey
- A photon can spend over 100,000 years just trying to reach the surface
- By the time it reaches the surface, it has 'cooled' into the light our eyes can see
- The Sun doesn't have a solid surface, just a layer where density drops
- The scale of time required to exit the Sun
- This 'departure lounge' is the part of the Sun we actually see from Earth
- The transformation of light energy during the journey
- The point of escape from the Sun's density
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives A Photon's Epic Journey the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
Why can't a photon travel in a straight line through the Sun's interior?
Get it right to open this lesson and 6 more in the app.
How to learn A Photon's Epic Journey, step by step
Go in order. 7 short levels across 2 sections, about 14 minutes in all, five minutes a day.
- 1
The Great Solar Escape
- The Thousand-Year Bumper Car Race
- 2
The Sprint to Earth
- Eight Minutes of Pure Speed
- The Final Landing
2 sections · 3 units · 7 levels. Built to play, not to enroll.
Questions about A Photon's Epic Journey
How do I learn A Photon's Epic Journey?
Go in order: start with The Great Solar Escape, then The Sprint to Earth. On Tomo that's 7 short levels, about 14 minutes in all, played five minutes a day. Start free and play the first level in under a minute.
Is there a Duolingo-style app for A Photon's Epic Journey?
Yes. Tomo works like Duolingo: short daily lessons, streaks and quick quizzes. A Photon's Epic Journey is one of its free courses, and you can type any other topic to get a course of your own.
Is the A Photon's Epic Journey course free?
Yes. A Photon's Epic Journey is playable on Tomo's free plan, which doesn't expire. No credit card, no waitlist. Download the app and start your first lesson.
How long does it take to learn A Photon's Epic Journey?
7 levels across 2 sections, about 14 minutes of play in total. It's built for five minutes a day, so you finish it a little at a time instead of all at once.
Do I need any background to start A Photon's Epic Journey?
No. It's pitched at a beginner level, so it starts where you are and builds up. If you can tap a phone, you can start.
Tomo is in ChatGPT
Tomo is also a ChatGPT plugin: the same playable courses, built and played inside your chat.
Add Tomo to ChatGPT- What to ask
- “Make me a Tomo course on black holes.” “Turn this chat into a Tomo course.”
- What you get
- Quick questions with instant feedback, hearts and stars, ready to play in about a minute.
- Where it goes
- No sign-up to start. Connect your Tomo account and your streak carries on in the app.
You pick the voice
A Photon's Epic Journey is taught in the Professor style: clear, structured, thorough. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
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Start A Photon's Epic Journey today.
Download Tomo, search A Photon's Epic Journey, and play your first lesson in under a minute.